Electric control overflow valve group

Abstract

The utility model discloses an electric control overflow valve group which comprises an overflow valve and an electromagnetic pilot operated valve, the overflow valve is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet is connected with a liquid source, the first liquid outlet is connected with a liquid return box, and the electromagnetic pilot operated valve comprises a first reversing valve and a second reversing valve. The first reversing valve has a first working state, the second reversing valve has a second working state, the pressure of the first liquid inlet is increased by controlling the first reversing valve to be switched to the first working state, and the pressure of the first liquid inlet is decreased by controlling the second reversing valve to be switched to the second working state. Liquid is discharged into or out of the overflow valve through the first reversing valve and the second reversing valve of the electromagnetic pilot operated valve, so that remote control over pressure is achieved, and adjustment is more accurate, faster and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially is related to a kind of electric control overflow valve group. BACKGROUND

[0002] Overflow valve is a kind of hydraulic system pressure regulating device, is widely used in spray pump station, and the pressure of high-pressure water required by dust removal spray of working face is regulated by overflow valve.

[0003] The pressure regulating mode of overflow valve in prior art is manually adjusted, to control system pressure, but it is inconvenient to operate by this mode, and the set pressure is unstable, remote adjustment cannot be realized, and it does not meet the requirements of intelligent mining development of coal mine. UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving the technical problem that manual adjustment overflow valve cannot realize accurate regulation and remote control in prior art.

[0005] Therefore, one purpose of the utility model is to propose electric control overflow valve group, the electric control overflow valve group includes overflow valve and electromagnetic pilot valve, the overflow valve has first liquid inlet and first liquid outlet, the first liquid inlet is connected with liquid source, the first liquid outlet is connected with return liquid tank, the electromagnetic pilot valve includes first reversing valve and second reversing valve, the first reversing valve has first working state, the second reversing valve has second working state, the pressure of the first liquid inlet is adjusted by controlling the first reversing valve to switch to the first working state to be higher, the pressure of the first liquid inlet is adjusted by controlling the second reversing valve to switch to the second working state to be lower.

[0006] In some embodiments, the electromagnetic pilot valve includes pilot valve body, first pressure regulating part and second pressure regulating part are arranged in the pilot valve body, the pressure of the first liquid inlet is adjusted by adjusting the first pressure regulating part to be higher, the pressure of the first liquid inlet is adjusted by adjusting the second pressure regulating part to be lower.

[0007] In some embodiments, the overflow valve includes overflow valve body, overflow valve cavity is arranged in the overflow valve body, the first liquid inlet and the first liquid outlet are communicated with the overflow valve cavity respectively, movable valve core is arranged in the overflow valve cavity, the overflow valve cavity is divided into first valve cavity and second valve cavity by the valve core, elastic member is arranged between the valve core and the overflow valve body.

[0008] In some embodiments, the first switching valve is provided with a second liquid inlet and a first working port, the second liquid inlet and the first liquid inlet are in communication, the first working port and the first valve cavity are in communication, when the first switching valve is switched to the first working state, the first working port and the second liquid inlet are in communication, when the first switching valve is switched to the third working state, the first working port and the second liquid inlet are cut off.

[0009] The second switching valve includes a third liquid inlet and a second working port, the third liquid inlet and the first valve cavity are in communication, the second working port and the liquid return tank are in communication, when the second switching valve is switched to the second working state, the third liquid inlet and the second working port are in communication, when the second switching valve is switched to the fourth working state, the third liquid inlet and the second working port are cut off.

[0010] In some embodiments, the electromagnetic pilot valve includes a first electromagnet, and the first electromagnet is controlled to be energized to switch the first switching valve to the first working state.

[0011] The electromagnetic pilot valve includes a second electromagnet, and the second electromagnet is controlled to be energized to switch the second switching valve to the second working state.

[0012] In some embodiments, the first switching valve is provided with a second liquid outlet, the second liquid outlet and the liquid return tank are in communication, and a first check valve is arranged between the first working port and the first valve cavity to enable the liquid to flow unidirectionally along the first switching valve to the overflow valve.

[0013] In some embodiments, the second switching valve is provided with a third liquid outlet, the third liquid outlet and the liquid return tank are in communication, and a second check valve is arranged between the second working port and the liquid return tank to enable the liquid to flow unidirectionally along the second working port to the liquid return tank.

[0014] In some embodiments, the electromagnetic pilot valve further includes a pilot valve body, a control cavity is arranged in the pilot valve body, the control cavity and the first valve cavity are in communication, the first pressure regulating part and the pilot valve body form a first chamber, the second pressure regulating part and the pilot valve body form a second chamber, the control cavity is in communication with the first chamber and the second chamber respectively, the first chamber and the first liquid inlet are in communication, and the second chamber and the first liquid outlet are in communication.

[0015] In some embodiments, the first pressure regulating part and the second pressure regulating part are adjusting plugs or stop valves respectively.

[0016] In some embodiments, a first filter is arranged between the first liquid inlet and the second liquid inlet.

[0017] In some embodiments, a second filter is arranged between the first liquid inlet and the first pressure regulating part.

[0018] In some embodiments, the electric control overflow valve group further comprises an accumulator, which is in communication with a control cavity of the electromagnetic pilot valve.

[0019] The electric control overflow valve group provided by the embodiment of the present application has the following beneficial effects:

[0020] By switching the first reversing valve and the second reversing valve of the electromagnetic pilot valve to the first working state or the second working state, liquid is discharged into or out of the overflow valve, thereby increasing or decreasing the pressure of the first liquid inlet, realizing remote control of the pressure of the overflow valve, and the adjustment is more accurate, fast and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0022] Figure 1 is the system principle diagram of the electric control overflow valve group in the embodiment of the present application;

[0023] Figure 2 is the perspective view of the electric control overflow valve group in the embodiment of the present application;

[0024] Figure 3 is the internal structure schematic view of the electric control overflow valve group in the embodiment of the present application;

[0025] Figure 4 is the internal structure schematic view of the electric control overflow valve group in the embodiment of the present application.

[0026] Reference signs:

[0027] 1, overflow valve; 11, first inlet; 12, first outlet; 13, overflow valve body; 14, overflow valve cavity; 141, first valve cavity; 142, second valve cavity; 15, valve core; 151, groove; 16, elastic member; 17, overflow valve seat; 18, first flow channel; 19, second flow channel; 2, electromagnetic pilot valve; 21, pilot valve body; 22, control cavity; 23, first reversing valve; 231, second inlet; 232, second outlet; 233, first working port; 24, second reversing valve; 241, third inlet; 242, third outlet; 243, second working port; 25, first pressure regulating part; 26, second pressure regulating part; 27, first chamber; 28, second chamber; 29, third flow channel; 210, fourth flow channel; 3, liquid source; 4, return tank; 5, accumulator; 6, pressure detection device; 7, first filter; 8, first check valve; 81, first check valve seat; 82, first check valve core; 83, first through hole; 84, second through hole; 9, second check valve. DETAILED DESCRIPTION

[0028] Various aspects and features of the present application are described herein below with reference to the accompanying drawings.

[0029] It is to be understood that various alterations and modifications can be made to the embodiments described herein. Thus, the above description should not be taken as limiting the present application but is made merely for the purposes of illustration and working of the only embodiments. Other modifications that one of ordinary skill in the art can come up with within the purview of the application and spirit of the application should be considered within the scope of the application.

[0030] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description given above and the detailed description of the embodiments given below, serve to explain the principles of the application.

[0031] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting examples only, with reference to the attached drawings.

[0032] It is also to be understood that even though a number of embodiments of the application have been described herein, many adaptations and modifications can be made within the scope and spirit of the application, and the above disclosure is intended to be merely illustrative of preferred forms of the present application. The scope of the application should, therefore, be limited only by the claims that follow.

[0033] The above and other aspects, features, and advantages of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting examples only, with reference to the accompanying drawings.

[0034] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0035] The first embodiment of this utility model provides an electrically controlled overflow valve assembly, such as... Figures 1-4 As shown, the electrically controlled overflow valve assembly includes an overflow valve 1 and an electromagnetic pilot valve 2. The overflow valve 1 has a first liquid inlet 11 and a first liquid outlet 12. The first liquid inlet 11 is connected to the liquid source 3, and the first liquid outlet 12 is connected to the return liquid tank 4.

[0036] Specifically, such as Figure 3 As shown, the overflow valve 1 includes an overflow valve body 13, an overflow valve cavity 14 is provided inside the overflow valve 1, a movable valve core 15 is provided inside the overflow valve cavity 14, a first inlet 11 and a first outlet 12 are provided on the side of the overflow valve body 13, and the first inlet 11 and the first outlet 12 are respectively connected to the overflow valve cavity 14, and an elastic element 16 is provided between the valve core 15 and the end of the overflow valve body 13 away from the first inlet 11. Taking the vertical configuration of the overflow valve 1 as an example, the valve core 15 divides the overflow valve chamber 14 into a first valve chamber 141 and a second valve chamber 142. Since the valve core 15 can move within the overflow valve chamber 14 due to the combined action of the pressure of the first valve chamber 141 and the pressure of the second valve chamber 142, the valve core 15 can be moved along the overflow valve chamber 14 by changing the pressure of the first valve chamber 141, thereby changing the opening between the first inlet 11 and the first outlet 12, and thus changing the pressure of the first inlet 11 of the overflow valve 1.

[0037] Furthermore, the electromagnetic pilot valve 2 includes a pilot valve body 21 and a directional valve. The pilot valve body 21 contains a control chamber 22, which is connected to the first valve chamber 141. Therefore, by adjusting the pressure in the control chamber 22, the pressure in the first valve chamber 141 can be adjusted.

[0038] In addition, the electrically controlled overflow valve assembly also includes an accumulator 5, which has an internal energy storage chamber connected to the control chamber 22. This allows the pressure in the control chamber 22 to be controlled by adjusting the pressure in the energy storage chamber. When the instantaneous pressure in the control chamber 22 increases, the accumulator 5 converts the energy in the pipeline system into compressible energy or potential energy and stores it in the energy storage chamber. When the instantaneous pressure in the control chamber 22 decreases, the accumulator 5 converts the compressible energy or potential energy into hydraulic or pneumatic energy and releases it to replenish the system, thus stabilizing the pressure and ensuring normal pressure throughout the system.

[0039] Among them, such as Figure 2 As shown, the pilot valve body 21 is installed at one end of the overflow valve body 13, and the directional valve is installed at the end of the pilot valve body 21 away from the overflow valve body 13. The overflow valve body 13, the pilot valve body 21, and the directional valve are arranged sequentially along the first direction (the length direction of the overflow valve body 13). This arrangement helps to reduce the thickness of the electro-hydraulic overflow valve assembly to accommodate installation positions with limited space in the width direction. Furthermore, the accumulator 5 is located at the end of the pilot valve body 21 away from the overflow valve body 13, that is, the accumulator 5 and the directional valve are located on the same side of the pilot valve body 21. This can make reasonable use of space and reduce the footprint of the electro-hydraulic overflow valve assembly 1.

[0040] A pressure detection device 6 is installed on the pilot valve body 21 to detect the pressure of the first inlet 11 or the pressure of the first valve chamber 141. The pressure detection device 6 is located on the same side of the pilot valve body 21 as the reversing valve, making reasonable use of space.

[0041] Furthermore, such as Figure 3 As shown, a groove 151 is formed at one end of the valve core 15 near the first chamber 27. One end of the elastic member 16 abuts against the groove 151, and the other end of the elastic member 16 abuts against the pilot valve body 21. Thus, after the valve core 15 moves along the overflow valve chamber 14, the elastic member 16 resets the valve core 15. In addition, an overflow valve seat 17 is provided in the overflow valve chamber 14. The overflow valve seat 17 is disposed on the outer periphery of the valve core 15 and abuts against the inner wall of the overflow valve chamber 14. The overflow valve seat 17 has an inclined surface that abuts against the valve core 15. In the initial state, the valve core 15 is pressed against the overflow valve seat 17 by the elastic force of the elastic member 16, and the inclined surface seals the space between the first inlet 11 and the first outlet 12.

[0042] Further, the first flow channel 18 and the second flow channel 19 are arranged in the overflow valve body 13, and the reversing valve includes a first reversing valve 23 and a second reversing valve 24. One end of the first flow channel 18 is in communication with the first liquid inlet 11, and the other end of the first flow channel 18 is in communication with the control cavity 22 through the first reversing valve 23. One end of the second flow channel 19 is in communication with the first liquid outlet 12, and the other end of the second flow channel 19 is in communication with the control cavity 22 through the second reversing valve 24. The first flow channel 18 and the second flow channel 19 herein play a damping role, and it is easier to realize pressure regulation of the control cavity 22.

[0043] Further, the first filter 7 is arranged between the first liquid inlet 11 and the second liquid inlet 231, and the first filter 7 filters the liquid entering the electrically controlled overflow valve group from the first liquid inlet 11, so as to avoid impurities from entering, thereby prolonging the service life of the electrically controlled overflow valve group.

[0044] Further, in some embodiments, as shown in Figure 1 and Figure 3 the first reversing valve 23 includes a second liquid inlet 231 and a first working port 233, the second liquid inlet 231 is in communication with the first liquid inlet 11, and the first working port 233 is in communication with the control cavity 22. At this time, the first reversing valve can be understood as a two-position two-way valve. The first reversing valve 23 has a first working state and a third working state, and the electromagnetic pilot valve includes a first electromagnet. By controlling the first reversing valve 23 to switch to the first working state, the pressure of the first liquid inlet 11 can be increased, that is, when the first electromagnet is powered on to switch the first reversing valve 23 to the first working state, the first working port 233 is in communication with the second liquid inlet 231, and the liquid entering the electro-hydraulic controlled overflow valve 1 group from the first liquid inlet 11 can enter the control cavity 22 through the second liquid inlet 231 and the first working port 233, and then enter the first valve cavity 141, thereby increasing the pressure of the first valve cavity 141. The pressure above the spool 15 increases, so that the spool 15 moves downward, the opening between the first liquid inlet 11 and the first liquid outlet 12 decreases, and the pressure of the first liquid inlet 11 increases. By controlling the first electromagnet to be powered off, the first reversing valve 23 can be switched to the third working state. When the first reversing valve 23 is switched to the third working state, the second liquid inlet 231 and the first working port 233 are cut off.

[0045] In another embodiment, the first reversing valve 23 comprises a second liquid inlet 231, a second liquid outlet 232 and a first working port 233, the second liquid inlet 231 and the first liquid inlet 11 are in communication, the second liquid outlet 232 and the liquid return tank 4 are in communication, the first working port 233 and the control cavity 22 are in communication, at this time, the first reversing valve 23 can be understood as a two-position three-way valve, the first working port 233 and the control cavity 22 are in communication through the first one-way valve 8, so that the liquid flows unidirectionally from the first working port 233 to the control cavity 22. Among them, the first reversing valve 23 has a first working state and a third working state, the electromagnetic pilot valve comprises a first electromagnet, and the pressure of the first liquid inlet 11 can be increased by controlling the first reversing valve 23 to switch to the first working state, that is: when the first electromagnet is powered on to switch the first reversing valve 23 to the first working state, the second liquid inlet 231 and the second liquid outlet 232 are closed, the second liquid outlet 232 and the first working port 233 are closed, and the first working port 233 and the second liquid inlet 231 are in communication, and then the liquid entering the electro-hydraulic control overflow valve 1 group from the first liquid inlet 11 can pass through the second liquid inlet 231, the first working port 233 and the first one-way valve 8 into the control cavity 22, and then into the first valve cavity 141, thereby increasing the pressure of the first valve cavity 141, the pressure above the spool 15 increases, and the spool 15 moves downward, the opening between the first liquid inlet 11 and the first liquid outlet 12 decreases, and the pressure of the first liquid inlet 11 increases.

[0046] The first reversing valve 23 can be switched to the third working state by controlling the first electromagnet to be de-energized, when the first reversing valve 23 is switched to the third working state, the second liquid inlet 231 and the first working port 233 are closed, the second liquid inlet 231 and the second liquid outlet 232 are closed, the second liquid outlet 232 and the first working port 233 are in communication, and because the first working port 233 and the control cavity 22 are in communication through the first one-way valve 8, the liquid can only flow unidirectionally from the first working port 233 to the control cavity 22, and will not flow back to the liquid return tank 4 through the second liquid outlet 232 from the control cavity 22 and the first valve cavity 141, so as to ensure that the pressure in the first valve cavity 141 remains stable when the first electromagnet is de-energized. Specifically, as Figure 3 and Figure 4As shown, the first reversing valve 23 and the overflow valve 1 are provided with the first check valve 8, and the second liquid outlet 232 of the first reversing valve 23 is connected with the liquid return tank 4. Specifically, the first check valve 8 is arranged in the pilot valve body 21, the third flow channel 29 is arranged in the pilot valve body 21, the first check valve 8 is connected with the first working port 233 through the third flow channel 29, and the first check valve 8 is connected with the control cavity 22 through the fourth flow channel 210. The first check valve 8 includes a first check valve seat 81 and a first check valve core 82, the first check valve seat 81 is provided with a fifth valve cavity, the first check valve core 82 is arranged in the fifth valve cavity in a slidable manner, the outer periphery of the first check valve seat 81 is provided with a first through hole 83 connected with the third flow channel 29, one end of the first check valve seat 81 is provided with a second through hole 84 connected with the fourth flow channel 210, one end of the first check valve core 82 is provided with a clamping portion for cooperating with the first check valve seat 81 to connect or cut off the first through hole 83 and the second through hole 84. The liquid in the first working port 233 enters the fourth flow channel 210 through the first through hole 83 and the second through hole 84 along the third flow channel 29, and then enters the control cavity 22. The liquid can only flow from the first through hole 83 to the second through hole 84, and cannot flow from the second through hole 84 to the first through hole 83, which can ensure that the pressure of the first liquid inlet 11 of the electric control overflow valve group remains unchanged when the first electromagnet is powered off.

[0047] It should be noted that for the first reversing valve 23 with the second liquid outlet 232, the similar function to the scheme of arranging the first check valve 8 can be realized by plugging the second liquid outlet 232. The pressure blocking function is realized, and the pressure remains stable when powered off, which ensures the accuracy of pressure regulation.

[0048] Further, in some embodiments, as Figure 1 and Figure 3As shown, the second reversing valve 24 includes a third inlet port 241 and a second working port 243, the third inlet port 241 and the control cavity 22 are in communication, the second working port 243 and the liquid return tank 4 are in communication, for example, a two-position two-way valve. Wherein the second reversing valve 24 has a second working state and a fourth working state, the electromagnetic pilot valve 2 includes a second electromagnet, by controlling the second reversing valve 24 to switch to the second working state, the pressure of the first inlet port 11 can be reduced, that is: when the second electromagnet is controlled to be powered on to switch the second reversing valve 24 to the second working state, the third inlet port 241 and the second working port 243 are in communication, and then the high-pressure liquid in the first valve cavity 141 enters the liquid return tank 4 through the second working port 243 after the control cavity 22, thereby reducing the pressure of the first valve cavity 141, the pressure above the spool 15 decreases to make the spool 15 move downward, the opening between the first inlet port 11 and the first outlet port 12 becomes larger, and the pressure of the first inlet port 11 decreases. By controlling the second electromagnet to be de-energized, the second reversing valve 24 can be switched to the fourth working state, at this time, the third inlet port 241 and the third working port are cut off.

[0049] In another embodiment, as Figure 1 and Figure 3As shown, the second reversing valve 24 includes a third liquid inlet 241, a third liquid outlet 242 and a second working port 243, the third liquid inlet 241 and the control cavity 22 are in communication, the third liquid outlet 242 and the liquid return tank 4 are in communication, the second working port 243 and the liquid return tank 4 are in communication, for example, a two-position three-way valve, a second check valve 9 is arranged between the second working port 243 and the liquid return tank 4. Wherein, the second reversing valve 24 has a second working state and a fourth working state, the electromagnetic pilot valve 2 includes a second electromagnet, by controlling the second reversing valve 24 to switch to the second working state, the pressure of the first liquid inlet 11 can be reduced, that is: when the second electromagnet is controlled to be powered on to switch the second reversing valve 24 to the second working state, the third liquid inlet 241 and the third liquid outlet 242 are closed, the third liquid outlet 242 and the second working port 243 are closed, and the third liquid inlet 241 and the second working port 243 are in communication. In turn, the high-pressure liquid in the first valve cavity 141 passes through the second working port 243 after the control cavity 22 to enter the liquid return tank 4, thereby reducing the pressure of the first valve cavity 141, the pressure above the valve core 15 decreases to make the valve core 15 move downward, the opening between the first liquid inlet 11 and the first liquid outlet 12 becomes larger, and the pressure of the first liquid inlet 11 decreases. By controlling the second electromagnet to be de-energized, the second reversing valve 24 can be switched to the fourth working state, when the second reversing valve 24 is switched to the fourth working state, the third liquid inlet 241 and the third liquid outlet 242 are closed, the third liquid inlet 241 and the third working port are closed, and the third liquid outlet 242 and the second working port 243 are in communication. Since the second working port 243 and the liquid return tank 4 are provided with a second check valve 9, the liquid can only flow from the second working port 243 to the liquid return tank 4, and cannot flow from the liquid return tank 4 to the second working port 243 (control cavity 22), thereby ensuring the safe operation of the electro-hydraulic control overflow valve group 1.

[0050] Further, the electro-hydraulic control overflow valve group is connected with a controller, the controller is configured to switch the first reversing valve 23 to the first working state when the pressure of the first liquid inlet 11 is lower than a first preset value, and switch the second reversing valve 24 to the second working state when the pressure of the first liquid inlet 11 is higher than a second preset value. The first preset value and the second preset value here refer to the pre-set pressure value of the first liquid inlet 11 required by the system, between the first preset value and the second preset value, the system can ensure safe and stable operation, wherein the first preset value is the lower limit value of the pressure at the first liquid inlet 11, and the second preset value is the upper limit value of the pressure at the first liquid inlet 11. By remotely controlling the first reversing valve 23 and the second reversing valve 24, the pressure adjustment of the overflow valve 1 can be realized, and accurate adjustment can be realized, thereby realizing intelligent control of the electro-hydraulic control overflow valve group.

[0051] Further, asFigure 3 As shown, the pilot valve body 21 is further provided with a third valve cavity and a fourth valve cavity, the first pressure regulating part 25 is slidably arranged in the third valve cavity, the second pressure regulating part 26 is slidably arranged in the fourth valve cavity, the first pressure regulating part 25 and the pilot valve body 21 form a first chamber 27, the second pressure regulating part 26 and the pilot valve body 21 form a second chamber 28, the control cavity 22 is in communication with the first chamber 27 and the second chamber 28 respectively, the first chamber 27 is in communication with the first liquid inlet 11, and the second chamber 28 is in communication with the first liquid outlet 12. The first pressure regulating part 25 and the second pressure regulating part 26 herein are adjusting plugs or stop valves, which play a role in manual pressure regulation. When the pressure is regulated by the first reversing valve 23 and the second reversing valve 24, the first pressure regulating part 25 and the second pressure regulating part 26 are adjusted to block the third valve cavity and the fourth valve cavity respectively. The electric control overflow valve group retains the function of manual adjustment, can select two modes of electric control adjustment and manual adjustment according to the needs of users, and has a wider range of application.

[0052] Specifically, when the pressure of the overflow valve 1 is regulated by the first pressure regulating part 25 and the second pressure regulating part 26, if it is needed to increase the pressure of the first liquid inlet 11 of the overflow valve 1, the position of the first pressure regulating part 25 in the third valve cavity is adjusted to increase the space of the first chamber 27, the liquid entering the overflow valve body 13 through the first liquid inlet 11 passes through the first chamber 27 along the first flow channel 18 to enter the first valve cavity 141, so as to increase the pressure of the first valve cavity 141, the pressure above the valve core 15 increases to make the valve core 15 move downward, the opening between the first liquid inlet 11 and the first liquid outlet 12 decreases, and the pressure of the first liquid inlet 11 increases accordingly. If it is needed to decrease the pressure of the first liquid inlet 11 of the overflow valve 1, the position of the second pressure regulating part 26 in the fourth valve cavity is adjusted to increase the space of the second chamber 28, the high-pressure liquid in the first valve cavity 141 passes through the second chamber 28 and the second flow channel 19 to enter the first liquid outlet 12, and then flows into the liquid tank 4, so as to decrease the pressure of the first valve cavity 141, the pressure above the valve core 15 decreases to make the valve core 15 move upward, the opening between the first liquid inlet 11 and the first liquid outlet 12 increases, and the pressure of the first liquid inlet 11 decreases accordingly.

[0053] In other embodiments, when the electromagnetic pilot valve cannot be used due to electric control failure or other reasons, the first reversing valve and the second reversing valve can be manually controlled to keep the system working normally.

[0054] A second filter is arranged between the first liquid inlet 11 and the first pressure regulating part 25, which filters the liquid entering the first valve cavity 141 from the first liquid inlet 11 to avoid impurities from entering, thereby prolonging the service life of the electric control overflow valve group.

[0055] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0056] In the description of the utility model, "first feature", "second feature" can include one or more features.

[0057] In the description of the utility model, "multiple" means two or more.

[0058] In the description of the utility model, the "above" or "below" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0059] In the description of the utility model, the "above", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0060] In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An electrically controlled spill valve group, characterized by, The overflow valve and the electromagnetic pilot valve, the overflow valve has a first inlet and a first outlet, the first inlet is connected with a liquid source, the first outlet is connected with a return tank, the electromagnetic pilot valve includes a first reversing valve and a second reversing valve, the first reversing valve has a first working state, the second reversing valve has a second working state, the pressure of the first inlet is raised by controlling the first reversing valve to switch to the first working state, the pressure of the first inlet is lowered by controlling the second reversing valve to switch to the second working state; and / or The electromagnetic pilot valve includes a pilot valve body, the first pressure regulating part and the second pressure regulating part are arranged in the pilot valve body, the pressure of the first inlet is raised by adjusting the first pressure regulating part, the pressure of the first inlet is lowered by adjusting the second pressure regulating part.

2. The electrically controlled spill valve group according to claim 1, characterized in that The overflow valve includes an overflow valve body, an overflow valve cavity is arranged in the overflow valve body, the first inlet and the first outlet are communicated with the overflow valve cavity, a movable valve core is arranged in the overflow valve cavity, the valve core separates the overflow valve cavity into a first valve cavity and a second valve cavity, an elastic element is arranged between the valve core and the overflow valve body.

3. The electrically controlled spill valve group according to claim 2, characterized in that The first reversing valve has a third working state, the first reversing valve is provided with a second inlet and a first working port, the second inlet and the first inlet are communicated, the first working port and the first valve cavity are communicated, when the first reversing valve switches to the first working state, the first working port and the second inlet are communicated, when the first reversing valve switches to the third working state, the first working port and the second inlet are cut off. The second reversing valve has a fourth working state, the second reversing valve includes a third inlet and a second working port, the third inlet and the first valve cavity are communicated, the second working port and the return tank are communicated, when the second reversing valve switches to the second working state, the third inlet and the second working port are communicated, when the second reversing valve switches to the fourth working state, the third inlet and the second working port are cut off.

4. The electrically controlled spill valve group according to claim 3, characterized in that The first reversing valve is provided with a second outlet, the second outlet and the return tank are communicated, a first check valve is arranged between the first working port and the first valve cavity, so that the liquid flows unidirectionally along the first reversing valve to the overflow valve.

5. The electrically controlled spill valve group according to claim 3, wherein The second reversing valve is provided with a third outlet, the third outlet and the return tank are communicated, a second check valve is arranged between the second working port and the return tank, so that the liquid flows unidirectionally along the second working port to the return tank.

6. The electrically controlled spill valve group according to claim 3, wherein The electromagnetic pilot valve includes a first electromagnet, the first electromagnet is controlled to be electrified to switch the first reversing valve to the first working state; The electromagnetic pilot valve includes a second electromagnet, the second electromagnet is controlled to be electrified to switch the second reversing valve to the second working state.

7. The electrically controlled spill valve group according to claim 2, wherein The electromagnetic pilot valve further includes a pilot valve body, a control cavity is arranged in the pilot valve body, the control cavity and the first valve cavity are communicated.

8. The electrically controlled spill valve group according to claim 7, characterized in that The first pressure regulating part and the pilot valve body form a first chamber, the second pressure regulating part and the pilot valve body form a second chamber, the control chamber is in communication with the first chamber and the second chamber respectively, the first chamber is in communication with the first liquid inlet, and the second chamber is in communication with the first liquid outlet.

9. The electrically controlled spill valve group according to claim 3, wherein A first filter is arranged between the first liquid inlet and the second liquid inlet; and / or A second filter is arranged between the first liquid inlet and the first pressure regulating part.

10. The electrically controlled spill valve group according to claim 1, wherein The electric control overflow valve group further comprises an accumulator, and the accumulator is in communication with the control chamber of the electromagnetic pilot valve.

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